Combined air and gas mixer and controller.



J. H. MARTINDALE. COMBINED AIR AND GAS MIXER AND CONTROLLER.

' APPLICATION FILED DEO.16, 1907. 91 8,879, Patented Ap'r.'20, 1909.

2 SHEETS-SHEET 1.

ATTBST I 6%? W I INYENTOR 5Z0 Ehn HMarhndale.

BY ATTYS.

J. H. MARTINDALE. COMBINED AIR AND GAS MIXER. AND CONTROLLER.

APPLICATION FILED DEO.16, 1907.

Patented Apr. 20, 1909.

2 SHEETS-SHEET 2.

ATTEST Iwm'mn 6 1M John HMartmdmc. I W Y I W ATEYS- scribed and UN TED strATEs PATENT oi ricn.

Specification of LettersI atent.

JOHN H. MARTINDALE, or CLEVELAND, omo.

COMBINED AND GAS MIXER AND CONTROLLER.

dP atented April 20, 1909.

Application filed December 16, 1907. Serial No. 406,596

To all whom it may concern:

Be it known that I, J OHN H. MARTINDALE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in a Combined Air and Gas Mixer and Controller, and do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to a combined air and gas mixer and controller, and the invention consists in the construction and combination of parts substantially as shown and departicularly pointed out "in the claims.

In the accompanying drawings, Figure l is a sectional elevation of my invention in a form adapting it more'particularly to steam.

- boilers, and Fig. 2 is an elevation of a battery of mixerslooking from the inside of the furnace and corresponding to a look from the right of Fig. 1. Fig. 3 is an enlarged central longitudinal section of one of the .several mixers and parts associated thereseries of valve controlling with. Fig. 4 is a perspective view of one of 'my improved gas controlling valves, and Fig.

5 is a crosssection of a mixer and parts on line corresponding substantially to 5 5,' Fig. 3. Fig. 6 is a -.perspective'view of a disks and shaft on which they are mounted.

The invention is shown herein as especially adapted to steam boilers, butthis represents only one of the several adaptations .or applications, thereof and which are comprised in its complete conception, such as kitchen fringes, heating furnaces, dwellings and the invention, butthe mixer remains essentially the same in all cases and constitutes the es-:

several series of mixers arranged horizontally one over the other andafive in each series. These series together constitute a so-called battery, ands batterymayconsist of one or' Obviously also,.the sizes of the-parts will vary according to" the uses thereof, and there may be incidental changes here and there to meetdifierent adaptations of the more series or a plurality of the mixers, say

two or more, and as all the mixers shown herein are alike in construction and operation, a detailed description of one will answer for all. Thus, in Fig. 1, We have a longitudinal sec-, tion of one of thelower mixers in the several series, and in Fig. 3 an enlarged longitudinal sectional elevation thereof clearly illustrating all the details. As shown in these views B represents a front supporting and containing body provided with a chamber C common to all the mixers, and E is a gas supply pipe forsaid chamber. The said base or body B is supported in front of the furnace (not. shown) in any suitable way, and is provided at its inner side with as many openings as there are mixers and which 0 enings are provided with separate detac able caps or Slates D, fixed in place by screws or bolts The said caps or plates have central internally threaded holes supporting valve nipples N, threaded therein, and said valves have stem 4, a backing for spring 5 for the valve on the stem thereof, and as a screen to arrest possible foreign particles that might otherwise pass in with the gas and obstruct the valves.- Hence, also, these parts severally are removable for repairs and cleansing, and each mixe'rconstitutes a complete unit in the organization. The said caps or lplates Dare provided-each with an externa y threaded boss 7, upon which the mixer tubes M are threaded, and said tubes are each provided with two or more series of inwardly and forwardly projected or inclined air supplying or feeding pipe shaped nipples or stems 8 running preferabl in rows from end to end at regular interva apart, and the said nipples or. stems communicate with openings through the wall of tube M and are of grad ually, decreased length from end to end of said tubebeginning with the longest about or at thegoint of gas injecting nipple N, as

about the nipple, I cause the mixing or commingling of the air and gas to'begin at once, because the gas produces a syphoning action on the air under these conditions, and this continues throughout the entire length of the mixing tube. Obviously the area over which the jet or stream of gas issuing through nipple N expands or widens increases gradually toward the discharge end of the mixer tube, and the air supply pipes or tubes 8 are gradually shortened to accommodate them-.

selves to these changes.

The total practical effect of this construction and arrangement of parts is to .obtain a much more perfect admixture of gas and air in a given length of mixer tube than is possible in a plain tube with mere holes through its side but omitting the tubular or pipe shaped feeders 8, which in all cases deiver the air directly into the gas area and where the gas is exerting a suction upon the air.

Now, in order that the relative proportions of gas and air may be maintained at a uniform ratio throughout all manipulations of the gas valve, and whether large or small volumes of as be used, I provide two separate tubular s eeves, G and H, about mixer tube M.. The inner sleeve G is provided with holes g corresponding to the air supply projections 8, and the outer tube H has holes h corresponding to holes g, and sleeve G is adapted to be rotated upon tube M to graduate or govern the passage of air into the mixer, while tube H is adapted to be set at one point or another to definitely fix the inflow of air, whether more orless.

such re v highest attainable economy of gas for the The matter of relative pro ortions of air and gas to obtain erfect com ustion and to economize gas has een especially considered in this organization of my mixer, and I believe that the constructions and adjustments herein lprovided". are adapted to maintain ations ofthe parts aswill afford the amount consumed. :Hence the inner tube G is operativelyconnected with gas controlling valve V, and said tube is practically a .valve tube or tubular valve because it does govern the supply of air to' the mixer. Thisunitary operation and control of valves V and G; repeats itself with each series of mixers respectively, three all told in this case. I might of course connect all the series under one operation, sothat corresponding valves or one or mbrevalves in each series would be reached at a time, or all at the same time and in like or warying degrees or proportions, but I prefer the present arrangement which gives me progressive or successive. control of the several valves in each series' To this end I employ a rotatable shafts for each series of gas and air mixers, and said shafts are located in' chambers C and have their bearings in body B, and each shaft carries' a disk for each mixer in that series. These disks J, J J

J J, are fixed to rotate with their shaft and have recesses in their edges or peripheries of varying length according to the order in which they are to set in openin the gas valves V. Thus, the first valve to be 0 )ened' by the present arrangement is the midd 0 one in the series of five, having disk J with a recess 10. A single valve in a series is opened at a time to keep control of the gas used andthe heat produced, and it may be any one in the series, but I prefer to begin with the middle one, and recess 10 is accordingly short but sufficient to rest the head of the valve controlling bell-crank lever L therein in which position the valve is closed. Each valve is provided with a bell-crank lever of this kind, thelower arm of which engages in or with the extremity of valve spindle 4. In this instance each lever is pivoted in its angle on a projection or arm 11 rigid with cap or plate D. The next orsecond disk to come into action is J provided with a recess 12 of such length as to allow a sufficient measure of rotation of shaft S to open the valve to the first mixer before the second one is opened by said disk. The third disk J 2 with'its recess 13 is the third to act, and is correspondingly longer than recess 12 for a like purpose, and so on as to the remaining disks J 3 and J and the recesses 14 and 15 therein of still greater length, actuation of a valve through its lever not taking lace till the head 9 ofthe lever rides out 0 its recess onto the peripheryof bers or characters to indicate how much gas has been turned on and the valves that are opened. In this way an engineer can tell exactly the amount of gas he is using, and having learned what he "can do with the index at a certain figure or a certain amount of gas he can set the device again to the same figure and be certain of the same results. By these means he can also see which valves are open.

Now referring again to the two sleeves or tubes G and H, 1t may be repeated that inner sleeve G is rotarily adjustable and outer outer sleeve longitudinally adjustable, and these sleeves. or tubes have separate actuation or control, the outer sleeve being essentially to fix the admission 9f air to greater or less volume, and the inner sleeve for governing or regulating the volume of air to be admitted up to the maximum that sleeve H permits to pass 'when it has been set in. any desired working position. That is to say, the said outer, sleeve may be so adjusted as to open its holes h more or less to the mixer, and according to amount ofdraft of stack, as the more suction of stack the greater mam Q ainount of air drawn in. Then, having this I tube fixed for the rightamount ofair under present conditions the tube or sleeve G. further governs the inflow of air'through its holes g, which are opened more or less asthe. mixers may require.

Outer sleeves H in a givenseries of mixers are controlled simultaneously and uniformly by toothed sectors 20 on rotatable crankshaft 21 engaging racksor teeth '22 on said sleeves. Inner sleeves G- are controlled from valve controlling shafts S, each of which car on a series of doublechanneled cams or cam wheels P, corresponding to'the sleeves G in each series of mixers, and said Wheels P have each a circumferentially inclined cross groove or path 26 running from one of the side channels 27- to the other and which constitutes the real cam portion of said Wheels and deter'- mines I the degree or distance of rotation of sleeve G. Each sleeve has a-headed stem 28 running in said channels and grooves which serves to rotate the sleeve to open and closed positions respectively as it traverses said cam 26 in one direction or the other. when the cam is rotated. Furthermore said cams 26 are staggered more or less to correspond with the location and action of the several valve controlling disks on shaft S and their recesses 10, v

12 and so on, the idea being to operate the valve sleeve G and open the same when the valve V corresponding thereto is opened,

thus admittingair and gas simultaneously to each mixer in its turn. But air is admitted only when-a gas valve is opened so as not to be required to heat more than the gas re 'uires and only as much as is necessary to o tain perfect" combustion, the plan being to utilize the maximum quantity of air with the mini- Ln combustion. i

- mum quantity of gas, thus-promoting econ-.

omy in gas and maintaining ideal conditions The channels cam wheels P' extend around said 'wheels so that the arm '2 8--on sleeve G can run therein andnot. affect the position of said sleeve except when a'shift ofv the sleeve is to be made to ;e1tl1er'open or close the-same.

Whatl 'claim is 1. In. a-gasv fuel equipment for furnaces, a gas mixer consisting ofa perforated inner tubehaving' inwardly projecting air conducting' nipples about its inside and air control-- ling sleeves about the outside thereof, in combinationwith a gassupply member open to.

' one end of said mixer, a valve for said memher, and means to open said valve- V 2. In gas fuel'equipments for furnaces, a

plurality of mixer-tubes'in substantiall the-v same plane and a valve for each W e, a sleeve about each tube adapted to-govern the supply of air thereto, and means to open and close the valve and the sleeve 'of each tube tube, whereby each rojection takes its own open said valve comprising aflrotatable shaft and a disk thereon, an air controlling sleeve about each mixer tube having openings between its ends and operatively connected with said valve, and means to control the flow of air through said sleeve.

4. A gas mixertube having asuccession of air inlets-between its ends in rows and a tubularprojection inside open to each of said airinlets, andan air controlling sleeve about said tube havingmpenings corresponding to said air inlets, a gascontrolling valve at the base of said mixer tube and a shaft and intervening mechanism 0 eratively connecting said valve and said s eeve to operate the same together.

.5. In a furnace and thelike, a gas mixer 'tube-having a plurality of series of air inlet projections running lengthwise thereof and inte ral with the wall of said mixer tube, in com ination with a rotatable sleeve about said mixer tube having holes corresponding to said projections and adapted to open and close the same. a

6. A gas mixer tube for furnaces and the like having a plurality of series of air inlet projections inside lengthwise'thereofand integral therewith and gradually decreasing in length from the base of the mixer to the dis charge end. Y

7. A gas mixer tube provided with a plu 'rality of .rows of air inlet projections on its inside integral therewith and inclined in the direction of the discharge. of the tube," said projections being gradually shorter toward the discharge end of the tube. i; j 8. A gas mixer tube having integral air inlet projections on'its inside successively be tween the ends of the tube. and inclined-at corresponding angles toward the discharge f and .open directly through the wall of'the 1 1 5 air sup 1y from witout thetube and the mixing egins at the ends of said projections. 9. A gas mixer tube having integral air inlet projections inclined from the wall of the. tube inwardly and forwardly, sleeves about said tube having openings'corres'ponding to said projections, and means for separatel operating saidsleeves to determinetlie vo ume of air admitted.

'10. A tubular gas mixer' having tubular" '-l2 5 andinclined air inlet'projections of varying lengths between its ends and all pointing to the axial center thereof, a rotatablemsleeve next about said'mixer and-a slidablesleeve' about said rotatable sleeve, said sleeves provided with air inlet openings adapted to register with said air inlet projections, a valve to admit gas a'nd'means to operate said valve and the time. i

11. A gas mixer having inclined air inlet tubes of gradually decreasing length from the base to the discharge end of the mixer, a valve controlled nipple discharging centrally into said mixer between the ends of said air inlet tubes, a plurality of air controlling sleeves about said mixer, means to slide one sleeve and means to rotate the other sleeve to govern the size ofthe air inlet.

12. A series of gas mixer tubes having each a plurality of series of air inlet projection's extending from the wall of the tube,

and asupport for said mixer tubes provided with a chamber common to all said tubes, a valve ,for each mixer tube and means in said chamber adapted to open one of said valves at a time comprising a rotatable shaft and disks thereon and levers operated thereby controlling said valves.

13. A series of gas mixers each having a succession of air inlets between its ends and sleeves about each, of said mixers having openings corresponding to -said inlets, in,

combination with a shaft and cam to rotate one of said sleeves and open and close said inlets and means to move the. other sleeve connections between said shaft and said gas valves.

15. A series of gas mixers having air inlets between their ends, an inner rotatable air governing sleeve over each mixer and an outer slidable sleeve over said inner sleeve having openings adapted to adjustably fix the maximum air openings to' said mixer through said sleeve.

16. A gas mixing tube for furnaces and the I like having opposite tubular projections on its inside open through the wall of the tube 1 to receive air and projecting at an inward and forward inclination, said projections arranged in a plurality of series and gradually shortened as they approach the discharge end of the tube. 7 I

17. A gas mixing tube having air inlet openings through its side and a rotatable sleeve with corresponding openings about said mixer, a cam to operate said sleeve having two circular channels about the same and a radially inclined passage connecting said, channels, and a projection on said sleeve said rotatable sleeve at the same.

adapted to run in said channels and passage and thus open and close said sleeve openings. 18. A series of air mixer tubes arranged side by side and having air inlet openings at intervals between their ends, an inner rotatable sleeve provided on each mixer tube provided with air inlet holes corresponding to the openings in said mixer tube and a slidable outer sleeve provided with openings adapted to register with those in said inner rotatable sleeve and means to adjust said outer sleeves to xthe maximum air opening through the same, and means to operate said inner sleeves successively to control the supply of air to said mixer tube.

19. A series of mixing tubes having inwardly and forwardly inclined tubular air inlet projections about their inner sides to conduct air into said tubes, a rotatable sleeve about each tube to govern the volume of air thus admitted, a shaft and a double channeled cam Wheel thereon for each tube having an inclined groove leadin from one of said channels to the other an a projection on each of said sleeves engaged in said channels and adapted to rotate said sleeve about the mixer as the cam wheel is rotated.

20. A series of mixing tubes having air inlet openings between their ends in two or more series, and a sleeve about each of said tubes adapted to govern the flow of air into the tube ,in combination with a shaft and cam wheels thereon to rotate said sleeves, each cam wheel having parallel channels and a transversely inclined groove leading from one channel to the other, a stem on each of said sleeves engaged in a corresponding cam Wheel, and the said cam wheels being arranged to cause the said sleeves to rotate successively.

21. The combination of a series 'of air mixers and an inner'and an outer sleeve about each mixer, the said sleeves and mixers having corresponding holes in series through the same between their ends for the passa e of air, a shaft and a cam wheel on said s aft for each of said mixers and a prothe flow of air thus limited being further determined by the inner sleeve.

In testimony whereof I sign this specifica tion in the presence of two witnesses.

- JOHN H. MARTINDALE. Witnesses:

R. B. MOSER, F. C. MUSSUN. 

